Notifications system
====================

LemonLDAP::NG can be used to notify some messages to users. If a user
has got some messages, they will be displayed when he access to the
portal. If a message contains some check boxes, the user has to check
all of them else he can not access to the portal and retrieves his
session cookie.

A notification explorer is available in Manager, and notifications can
be set for all users, with possibility to use display conditions. When
the user accept the notification, notification reference is stored in
his persistent session.

Installation
------------

Activation
~~~~~~~~~~

To activate notifications system:

Go to Manager ``General Parameters`` » ``Plugins`` » ``Notifications`` » ``Activation``

or in ``lemonldap-ng.ini`` [portal] section:

.. code-block:: ini

   [portal]
   notification = 1

Public notifications 
~~~~~~~~~~~~~~~~~~~~

Public notifications allows to display a carousel of messages to all users on the login page.
This plugin uses the Notification , they will be displayed when he access to the
portal. 

Disabled by default, you just have to activate it in the
Manager (``General Parameters`` » ``Plugins`` » ``Notifications`` »
``Public Notifications``)

or in ``lemonldap-ng.ini`` [portal] section:

.. code-block:: ini

   [portal]
   notificationsExplorer = 1
   publicNotification = 1

Usage
^^^^^

When enabled, create a notification for a "public" recipient. There are 3 types pf publibc recipients, "public-info", "public-warn", "public-error". Each will be displayed with a different color (respectively blue, yellow and red).

Examples
^^^^^^^^

JSON
''''

.. code::

   [{
   "uid": "public-info",
   "date": "2009-01-27",
   "reference": "ABC",
   "title": "Application Maintenance",
   "subtitle": "Application 1",
   "text": "Application 1 is scheduled to be in maintenance from 9am to 10 am and won't be available",
   },
   {
   "uid": "public-error",
   "date": "2009-01-27",
   "reference": "ABC",
   "title": "Application Maintenance",
   "subtitle": "Application 1",
   "text": "Application 1 is scheduled to be in maintenance from 9am to 10 am and won't be available",
   },
   {
   "uid": "public-warn",
   "date": "2009-01-27",
   "reference": "ABC",
   "title": "Application Maintenance",
   "subtitle": "Application 1",
   "text": "Application 1 is scheduled to be in maintenance from 9am to 10 am and won't be available",
   }] # No comma at the end


Explorer
~~~~~~~~

Notifications explorer allows users to see and display theirs accepted
notifications. Disable by default, you just have to activate it in the
Manager (``General Parameters`` » ``Plugins`` » ``Notifications`` »
``Explorer``)

or in ``lemonldap-ng.ini`` [portal] section:

.. code-block:: ini

   [portal]
   notificationsExplorer = 1

By default, just the three last notifications are displayed. You can
modify this by editing ``lemonldap-ng.ini`` [portal] section:

.. code-block:: ini

   [portal]
   notificationsMaxRetrieve = 3

Usage
^^^^^

When enabled, ``/mynotifications`` URL path is handled by this plugin.

Known issue
^^^^^^^^^^^

An XML document can contain several notifications messages. Just the
first one can be searched and displayed!


.. attention::

    Listed notifications are extracted from users
    persistent session (notification reference and accepted date). ONLY the
    notifications explorer can found in notifications backend are available
    to be displayed. Notifications content (title, subtitle and so on...) is
    not stored into persistent session.

Storage
~~~~~~~

By default, notifications will be stored in the same database as
configuration:

-  if you use "File" system and your "dirName" is set to
   /usr/local/lemonldap-ng/conf/, the notifications will be stored in
   /usr/local/lemonldap-ng/notifications/
-  if you use "CDBI" or "RDBI" system, the notifications will be stored
   in the same database as configuration and in a table named
   "notifications".
-  if you use "LDAP" system, the notifications will be stored in the
   same directory as configuration and in a branch named
   "notifications".

You can change default parameters using the "notificationStorage" and
"notificationStorageOptions" parameters with the same syntax as
configuration storage parameters. To do this in Manager, go in General
Parameters > Plugins > Notifications.

File
^^^^

Parameters for File backend are the same as
:doc:`File configuration backend<fileconfbackend>`.


.. attention::

    You need to create yourself the directory and set write
    access to Apache user. For example:

    ::

       mkdir /usr/local/lemonldap-ng/notifications/
       chown www-data /usr/local/lemonldap-ng/notifications/




.. tip::

    The file name default separator is ``_``, this can be a
    problem if you register notifications for users having ``_`` in their
    login. You can change the separator with the ``fileNameSeparator``
    option, and set another value, for example ``@``.

To summary available options:

-  **dirName**: directory where notifications are stored.
-  **fileNameSeparator**: file name separator.

DBI
^^^

Parameters for DBI backend are the same as
:doc:`DBI configuration backend<sqlconfbackend>`.

You can find the database schema in ``/usr/share/lemonldap-ng/ressources/notifications.*.sql``.

To summary available options:

-  **dbiChain**: DBI connection.
-  **dbiUser**: DBI user.
-  **dbiPassword**: DBI password.
-  **dbiTable**: Notifications table name.

.. note::

    DBI configuration example:

    ::

       notificationStorage = DBI
       notificationStorageOptions={  \
           'dbiChain'    => 'DBI:Pg:dbname=llng;host=mydb;port=5432', \
           'dbiTable'    => 'notifications', \
           'dbiUser'     => 'user', \
           'dbiPassword' => 'qwerty', \
       }

LDAP
^^^^

Parameters for LDAP backend are the same as
:doc:`LDAP configuration backend<ldapconfbackend>`.


.. attention::

    You have to create the branch by yourself

To summary available options:

-  **ldapServer**: LDAP URL.
-  **ldapBindDN**: LDAP user.
-  **ldapBindPassword**: LDAP password.
-  **ldapConfBase**: Notifications branch DN.

.. note::

    LDAP configuration example:

    ::

       notificationStorage = LDAP
       notificationStorageOptions={  \
           'ldapServer'       => 'ldap://localhost', \
           'ldapBindDN'       => 'cn=manager,dc=example,dc=com', \
           'ldapBindPassword' => 'secret', \
           'ldapConfBase'     => 'ou=notifications,ou=applications,dc=example,dc=com', \
       }


Wildcard
~~~~~~~~

The notifications module uses a wildcard to manage notifications for all
users. The default value of this wildcard is ``allusers``, but you can
change it if ``allusers`` is a known identifier in your system.

To change it, go in General Parameters > Plugins >
Notifications > Wildcard for all users, and set for example
``alluserscustom``.

Then creating a notification for ``alluserscustom`` will display the
notification for all users.

Using notification system
-------------------------


.. attention::

    Since version 2.0, notifications are now stored in JSON
    format. If you want to keep old format, select "use old format" in the
    Manager. Note that notification server depends on chosen format: REST
    for JSON and SOAP for XML.

Notification format
~~~~~~~~~~~~~~~~~~~

Notifications are JSON (default) or XML files containing:

-  <notification> element(s) :

   -  Required attributes:

      -  date: creation date (format YYYY-MM-DD WITHOUT time!)
      -  ref: a reference that can be used later to know what has been
         notified and when (Avoid ``_`` character)
      -  uid: the user login (it must correspond to the attribute set in
         whatToTrace parameter, uid by default), or the wildcard string
         (by default: ``allusers``) if the notification should be
         displayed for every user.

   -  Optional attributes:

      -  condition: condition to display the notification, can use all
         session variables.

   -  Sub elements:

      -  <title>: title to display: will be inserted in HTML page
         enclosed in <h2 class="notifText">...</h2>
      -  <subtitle>: subtitle to display: will be inserted in HTML page
         enclosed in <h2 class="notifText">...</h2>
      -  <text>: paragraph to display: will be inserted in HTML page
         enclosed in <p class="notifText">...</p>
      -  <check>: paragraph to display with a checkbox: will be inserted
         in HTML page enclosed in <p class="notifCheck"><input
         type="checkbox" />...</p>


.. attention::

    All other elements will be removed including HTML
    elements like <b>.


.. tip::

    One notification XML document can contain several
    notifications messages.

    Several notifications can be inserted with a single request by using an
    array of JSON (Tested with an array of 10,000 elements)

Variables
^^^^^^^^^

.. versionadded:: 2.21.0
   You can use session variables in notifications's ``text`` field by using the ``$varname`` syntax.
   Note that complex Perl expressions are not allowed, only simple variable interpolation.
   This feature is only available when using JSON notifications.


Examples
^^^^^^^^

JSON
''''

.. code::

   [{
   "uid": "foo",
   "date": "2009-01-27",
   "reference": "ABC",
   "title": "You have new authorizations",
   "subtitle": "Application 1",
   "text": "You have been granted to access to appli-1",
   # An array is required to set multi checkboxes
   "check": [
     "I agree",
     "Yes, I'm sure"
   ]
   },
   {
   "uid": "bar",
   "date": "2009-01-27",
   "reference": "ABC",
   "title": "You have new authorizations",
   "subtitle": "Application 1",
   "text": "You have been granted to access to appli-1",
   "check": "I agree"
   }] # No comma at the end


.. tip::

    JSON format notifications are displayed sorted by date and
    reference

XML
'''

.. code-block:: xml

   <?xml version="1.0" encoding="UTF-8" standalone="no"?>
   <root>
   <notification uid="foo.bar" date="2009-01-27" reference="ABC">
   <title>You have new authorizations</title>
   <subtitle>Application 1</subtitle>
   <text>You have been granted to access to appli-1</text>
   <subtitle>Application 2</subtitle>
   <text>You have been granted to access to appli-2</text>
   <subtitle>Acceptation</subtitle>
   <check>I know that I can access to appli-1 </check>
   <check>I know that I can access to appli-2 </check>
   </notification>
   <notification uid="allusers" date="2009-01-27" reference="disclaimer" condition="$ipAddr =~ /^192/">
   <title>This is your first access on this system</title>
   <text>Be a nice user and do not break it please.</text>
   <check>Of course I am not evil!</check>
   </notification>
   </root>

Create new notifications with notifications explorer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In Manager, click on ``Notifications`` and then on the ``Create``
button.

|image0|

Then fill all inputs to create the notification. Only the condition is
not mandatory.

When all is ok, click on ``Save``.

Notification server
~~~~~~~~~~~~~~~~~~~

LemonLDAP::NG provides two notification servers : SOAP and REST
depending on format.

If enabled, the server URL is https://auth.your.domain/notifications.

Notification server provides three API to insert (POST), delete (DELETE)
or list (GET) notification(s).

Available options:

-  **Server**: Enable/Disable notification server
-  **Default condition**: Condition appended to ALL notifications
   inserted by notification server (JSON format only)
-  **Notification parameters to send**: Notifications parameters
   returned by ``GET`` method
-  **HTTP methods**: Enable/Disable HTTP methods


.. attention::

    If notification server is enabled, you have to protect
    this URL by using the web server because there is no authentication
    required to use it.

Example:

.. code::

   # REST/SOAP functions for insert/delete/list notifications (disabled by default)
   <LocationMatch ^/(index\.fcgi/)?notifications>
       <IfVersion >= 2.3>
           Require ip 192.168.2.0/24
       </IfVersion>
       <IfVersion < 2.3>
           Order Deny,Allow
           Deny from all
           Allow from 192.168.2.0/24
       </IfVersion>
   </LocationMatch>

XML notifications through SOAP
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If you use old XML format, new notifications can be inserted or deleted
by using SOAP request, once SOAP is activated:

\* Insertion example in Perl
''''''''''''''''''''''''''''

.. code-block:: perl

   #!/usr/bin/perl

   use SOAP::Lite;
   use utf8;

   my $lite = SOAP::Lite
           ->uri('urn:Lemonldap::NG::Common::PSGI::SOAPService')
           ->proxy('http://auth.example.com/notifications');


   $r = $lite->newNotification(
   '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
   <root>
   <notification uid="foo.bar" date="2009-01-27" reference="ABC">
   <text> You have been granted to access to appli-1 </text>
   <text> You have been granted to access to appli-2 </text>
   <check> I know that I can access to appli-1 </check>
   <check> I know that I can access to appli-2 </check>
   </notification>
   </root>
   ');

   if ( $r->fault ) {
       print STDERR "SOAP Error: " . $r->fault->{faultstring};
   }
   else {
       my $res = $r->result();
       print "$res notification(s) have been inserted\n";
   }

\* Deletion example in Perl
'''''''''''''''''''''''''''

.. code-block:: perl

   #!/usr/bin/perl

   use SOAP::Lite;
   use utf8;

   my $lite = SOAP::Lite
           ->uri('urn:Lemonldap::NG::Common::CGI::SOAPService')
           ->proxy('http://auth.example.com/index.pl/notification');


   $r = $lite->deleteNotification('foo.bar', 'ABC');

   if ( $r->fault ) {
       print STDERR "SOAP Error: " . $r->fault->{faultstring};
   }
   else {
       my $res = $r->result();
       print "$res notification(s) have been deleted\n";
   }

JSON notifications through REST
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Insertion example with REST API
'''''''''''''''''''''''''''''''

Using JSON, you just have to POST json files.

For example with curl:

::

   curl -X POST -H "Content-Type: application/json" -H "Accept: application/json" -d @notif.json http://auth.example.com/notifications

Deletion example with REST API
''''''''''''''''''''''''''''''

DELETE API is available with LLNG ≥ 2.0.6

For example with curl:

::

   curl -X DELETE -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>/<reference>

List example with REST API
''''''''''''''''''''''''''

GET API is available with LLNG ≥ 2.0.6

For example with curl:

::

   # Retrieve 'wildcard' notifications
   curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications

   # Retrieve all pending notifications
   curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/_allPending_

   # Retrieve all existing notifications
   curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/_allExisting_

   # Retrieve all <uid>'s notifications
   curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>

   # Retrieve <uid>/<reference> notification parameters
   curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>/<reference>

Test notification
~~~~~~~~~~~~~~~~~

You've just to insert a notification and connect to the portal using the
same UID. You will be prompted.

|image1|

Try also to create a global notification (to the uid "allusers"), and
connect with any user, the message will be prompted.

.. |image0| image:: /documentation/manager-notification.png
   :class: align-center
.. |image1| image:: /documentation/portal-notification.png
   :class: align-center


JSON response
~~~~~~~~~~~~~

If a notification is pending, JSON response fields are:

-  ``result``: ``0``
-  ``error``: ``36``
-  ``ciphered_id``: a ciphered session id is returned in this field.
   This id can be used to forward and continue the notification process if you call the REST ``/notifback`` endpoint
   with a LL::NG cookie built with this id.
